Meghan Hodges
The ocean is an essential part of the global environment, influencing climate and weather patterns worldwide. However, human activities have led to ocean pollution and global warming, which are two crises that are fundamentally linked. The ocean has absorbed about 90% of the heat generated by rising emissions, causing unprecedented effects such as ice melting, sea-level rise, marine heatwaves, and ocean acidification. These changes in ocean temperature and chemistry are detrimental to marine life, such as coral reefs, and the millions of species that depend on them. Additionally, plastic pollution in the ocean, which affects two-thirds of studied fish species, is exacerbated by extreme weather events associated with global warming. Addressing these interconnected issues requires a shift towards a circular economy, where products are reused, refilled, and repaired, and the ocean's health is prioritised for climate resilience.
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What You'll Learn
Ocean pollution and climate change are linked
The ocean is an essential part of the global environment, influencing climate and weather patterns worldwide. It is also central to reducing global greenhouse gas emissions and stabilising the Earth's climate. The ocean absorbs excess heat and energy from the atmosphere, caused by rising greenhouse gas emissions, and about 90% of the heat generated by these emissions has been absorbed by the ocean. This has led to unprecedented effects, including ice-melting, rising sea levels, marine heatwaves, and ocean acidification.
Climate change is causing the death of coral reefs, which are home to many sea creatures. As the ocean warms, coral is damaged in a process called bleaching, and if this continues for too long, the coral dies. Coral reefs are also facing disease spread through plastic pollution. Warmer oceans are also causing the fish to move to cooler waters, which has led to the starvation of thousands of sea lion pups as they could not find their food.
Additionally, extreme weather events associated with climate change, such as flooding and storms, will increase the amount of plastic and chemical pollution in the sea. As permafrost melts, industrial chemicals that have been stored in the ice will be released back into the environment, posing a threat to marine life and human health.
To address these linked issues, it is essential to move towards a circular economy that reduces overconsumption and is free from harmful chemicals.
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Climate change impacts on the ocean
Climate change has a profound effect on the oceans, and the marine life and ecosystems within them. As the planet's greatest carbon sink, the ocean absorbs about 90% of the heat generated by rising emissions. This has a number of consequences, including:
Ice-melting and sea-level rise
The ocean's absorption of heat energy leads to a rise in water temperature, causing ice to melt and sea levels to rise. The latest data from the World Meteorological Organization shows that global mean sea level rose by an average of 4.77 mm per year between 2014 and 2023, reaching a new record high in 2023. This has exacerbated extreme events such as storm surges, flooding, erosion, and landslides, which are now expected to occur more frequently and with greater intensity.
Ocean warming and acidification
The warming of the oceans has a number of impacts on marine life and ecosystems. Firstly, it causes coral reefs to bleach and become more susceptible to infectious diseases. It also affects the distribution of marine species, with many fish populations shifting towards cooler waters at higher latitudes or deeper waters. This can disrupt fishing communities and industries that depend on specific fish species. Additionally, the absorption of carbon dioxide by the ocean leads to ocean acidification, which impacts some animals' ability to form shells or skeletons.
Extreme weather events
Climate change is associated with an increase in the frequency and intensity of extreme weather events such as floods, storms, and droughts. These events can, in turn, increase the amount of plastic and chemical pollution in the sea, as well as cause further damage to marine ecosystems.
Loss of marine biodiversity
The changes in ocean temperature and chemistry caused by climate change ultimately impact marine biodiversity. It is estimated that 60% of the world's marine ecosystems have already been degraded or are being used unsustainably. Climate change also affects the livelihoods of coastal communities, including those involved in fishing and aquaculture.
Overall, the impacts of climate change on the oceans are far-reaching and interconnected. Addressing these issues requires a holistic approach that considers both the reduction of greenhouse gas emissions and the protection and conservation of marine environments.
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How ocean pollution worsens global warming
Marine pollution and global warming are not separate issues. In fact, they are fundamentally linked. Oceans play a crucial role in mitigating global warming by absorbing excess heat and energy from the Earth's system, acting as the planet's greatest carbon sink. However, ocean pollution worsens global warming through various mechanisms:
Firstly, the ocean has absorbed about 90% of the heat generated by rising emissions, leading to unprecedented cascading effects such as ice melting, sea-level rise, marine heatwaves, and ocean acidification. These effects further intensify the impacts of global warming. For example, rising sea levels exacerbate deadly storm surges, coastal hazards, flooding, erosion, and landslides, putting coastal communities at greater risk.
Secondly, ocean pollution contributes to the decline of vital ocean habitats and ecosystems, such as coral reefs, seagrasses, and mangroves. Coral reefs, which are home to many sea creatures, are particularly vulnerable to both climate change and pollution. Climate change-induced warming of the oceans leads to coral bleaching, which can eventually kill the coral. Additionally, plastic pollution in the ocean spreads diseases to coral reefs and further exacerbates the problem. The loss of these ecosystems disrupts the food webs and reduces their ability to sequester carbon dioxide, thereby reducing their capacity to mitigate global warming.
Moreover, ocean pollution by industrial chemicals, such as polychlorinated biphenyls (PCBs), poses a significant threat. As the climate warms and the ice melts, these persistent chemicals are released back into the environment, endangering marine wildlife and human health. For example, PCB pollution is causing the UK orca population to collapse.
Furthermore, extreme weather events associated with global warming, such as flooding and storms, increase the spread of plastic pollution in the natural environment. Higher temperatures and more frequent marine heatwaves can also accelerate the breakdown of plastics, leading to the release of toxic chemicals and microplastics into the ocean.
Finally, addressing ocean pollution requires a transition to a circular economy that minimizes the use of harmful chemicals and promotes the reuse, refill, and repair of products. This transition can also help combat global warming by reducing the consumption of finite resources and lowering greenhouse gas emissions.
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The ocean as an ally against global warming
Climate change and ocean pollution are not separate issues. As the planet's greatest carbon sink, the ocean absorbs excess heat and energy released from rising greenhouse gas emissions. Today, the ocean has absorbed about 90% of the heat generated by rising emissions.
The ocean is the world's greatest ally against climate change. It generates 50% of the oxygen we need, absorbs 30% of all carbon dioxide emissions, and captures 90% of the excess heat generated by these emissions. It is not just the lungs of the planet but also its largest carbon sink, a vital buffer against the impacts of climate change.
Ocean habitats such as seagrasses and mangroves, along with their associated food webs, can sequester carbon dioxide from the atmosphere at rates up to four times higher than terrestrial forests. The ocean is also an incredible source of renewable energy – off-shore wind and ocean energy, derived from natural sources such as wind, water, and tides, that don't emit carbon dioxide or other greenhouse gases that contribute to global warming.
To limit the catastrophic impacts of climate change, the world needs to urgently reduce greenhouse gas emissions in line with the goals of the Paris Agreement. Ocean-based action can play a critical role in helping the world avoid the worst impacts of climate change, closing the emissions gap by as much as 35%.
By 2050, ocean-based climate solutions can help reduce our CO2 emissions and limit global warming to 1.5°C. Ongoing efforts to protect and restore blue carbon ecosystems (mangrove forests, seagrass meadows, and saltwater marshes) will maintain their role in absorbing CO2.
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The ocean's ability to absorb carbon dioxide
The ocean is the world's greatest carbon sink, absorbing about 30% of the carbon dioxide released into the atmosphere. This amounts to around 25% of carbon dioxide released by humans in recent decades. The ocean has absorbed about 90% of the heat generated by rising emissions, acting as a vital buffer against the impacts of climate change.
The Southern Ocean, which includes the Antarctic Circumpolar Current, is particularly effective at absorbing carbon dioxide. This current circulates more water than any other current and has a vast area over which to absorb carbon. The Southern Ocean's ability to absorb carbon dioxide is subject to natural fluctuations, making precise evaluations of its carbon uptake challenging.
Human activities have significantly impacted the ocean's carbon dioxide absorption capacity. The increase in atmospheric CO2 concentrations due to burning fossil fuels, deforestation, and other human activities has led to a corresponding increase in the ocean's absorption of carbon dioxide. This has resulted in ocean acidification, with the ocean's pH decreasing and becoming more acidic. The absorption of carbon dioxide by seawater initiates a series of chemical reactions, increasing the concentration of hydrogen ions and decreasing the pH. This process has far-reaching consequences for marine life, especially organisms that rely on calcium and carbonate from seawater to build shells and skeletons, such as oysters and corals.
Addressing the climate crisis and ocean pollution requires a holistic approach. Moving towards a circular economy that reduces the use of harmful chemicals and single-use products is essential for mitigating both issues. Additionally, conserving blue carbon ecosystems, such as mangroves and seagrasses, can enhance carbon sequestration and provide numerous ecological benefits.
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Frequently asked questions
Ocean pollution and global warming are not separate issues. Climate change is causing rising sea levels and temperatures, melting sea ice, and ocean acidification. Plastic pollution is a contributor to greenhouse gas emissions and is spread by extreme weather events caused by global warming. Both issues are detrimental to marine life and human health.
Two-thirds of all studied fish species, including those we eat, have ingested microplastics. Plastic kills almost a million seabirds globally each year. Industrial chemicals, such as polychlorinated biphenyls (PCBs), are still contaminating our oceans, despite being banned for years.
The ocean absorbs excess heat and energy from rising greenhouse gas emissions. This warming of the ocean leads to cascading effects, including the melting of ice, rising sea levels, marine heatwaves, and ocean acidification. Warmer waters also cause coral bleaching, which damages and kills coral reefs. Climate change further affects the timing of seasonal events, which can impact fisheries and marine ecosystems.
